Measurement
The SI System of Measurement The International System of Units (abbreviated SI) is the modern form of the metric system and is the world's most widely used system of measurement, used in both everyday commerce and science.
Units of Measurement length = meters (m) mass = kilograms (kg) liquid volume = liters (L) solid volume = cubic centimeters (cm 3 ) temperature = Kelvin (K) time = seconds (s)
Reporting Measurements Report what is known with certainty Add ONE digit of uncertainty (estimation) Davis, Metcalfe, Williams, Castka, Modern Chemistry, 1999, page 46
Measuring Length Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 122
Practice Measuring Timberlake, Chemistry 7 th Edition, page 7 cm
Practice Measuring 4.5 cm Timberlake, Chemistry 7 th Edition, page 7 cm
Practice Measuring 4.5 cm 4.55 cm Timberlake, Chemistry 7 th Edition, page 7 cm
Christopherson Scales Made in Normal, Illinois USA Measuring Mass 1 kg = 2.20 lb 1 kg (1000 g) 1 lb 0.20 lb
Reading a Triple Beam Balance
grams
Measuring Liquid Volume Graduated cylinder SyringeVolumetric flask BuretPipet
100 mL Graduated Cylinder Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 119
Reading a Meniscus line of sight too high reading too low reading too high line of sight too low proper line of sight reading correct graduated cylinder 10 mL
mL ? 15.0 mL
Measuring Solid Volume
V = L x W x H
Measuring Solid Volume V = L x W x H V = 7cm x 4cm x 3cm
Measuring Solid Volume V = L x W x H V = 7cm x 4cm x 3cm V = 84 cm 3
Water Displacement
How to Read a Thermometer (Celcius) o C o C o C
0oC0oC 10 o C 20 o C 30 o C 40 o C 50 o C 60 o C 0oC0oC 1oC1oC 2oC2oC 3oC3oC 4oC4oC 5oC5oC 6oC6oC 0oC0oC 5oC5oC 10 o C 15 o C 20 o C 25 o C 0oC0oC 20 o C 40 o C 60 o C 80 o C 100 o C 0oC0oC 20 o C 40 o C 60 o C 80 o C 100 o C Record the Temperature (Celcius) A B C D E 30.0 o C 3.0 o C19.0 o C 48.0 o C 60.0 o C